代谢
非布司他是通过UDP-葡萄糖醛酸基转移酶(UGT)和细胞色素P450(CYP)酶在肝脏中代谢的,每种酶同工型在非布司他代谢中的相对贡献尚未完全阐明。UGT1A1、UGT1A3、UGT1A9和UGT2B7介导非布司他的结合反应,这大约占到了给药总剂量的22-44%的代谢,产生酰基葡萄糖苷酸代谢物。CYP1A2、CYP2C8、CYP2C9和非P450酶负责氧化反应,这占到了剂量代谢的2-8%。氧化反应产生67M-1、67M-2和67M-4,这些都是药理活性的代谢物。67M-1、67M-2和67M-4可以进一步进行葡萄糖醛酸化和硫酸化。羟基代谢物在人体血浆中的浓度远低于母药。
Febuxostat is metabolized in the liver by UDP-glucuronosyltransferase (UGT) and Cytochrome P450 (CYP) enzymes, with the relative contribution of each enzyme isoform in the metabolism of febuxostat not fully elucidated. UGT1A1, UGT1A3, UGT1A9, and UGT2B7 mediate conjugation of febuxostat, which approximately accounts for 22–44% of the metabolism of the total dose administered, to produce the acyl-glucuronide metabolite. CYP1A2, CYP2C8, CYP2C9, and non-P450 enzymes are responsible for the oxidation reaction, which accounts for 2-8% of the metabolism of the dose. Oxidation reaction produces 67M-1, 67M-2, and 67M-4, which are pharmacologically active metabolites. 67M-1, 67M-2, and 67M-4 can further undergo glucuronidation and sulfation. Hydroxy metabolites are present in human plasma at much lower concentrations than the parent drug.
来源:DrugBank